takahe/templates/settings/_menu.html

<nav>
    <a href="{% url "settings_profile" %}" {% if section == "profile" %}class="selected"{% endif %}>Profile</a>
    <a href="#" {% if section == "interface" %}class="selected"{% endif %}>Interface</a>
    <a href="#" {% if section == "filtering" %}class="selected"{% endif %}>Filtering</a>
</nav>